73 lines
2.4 KiB
Python
73 lines
2.4 KiB
Python
from datetime import timedelta
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from decimal import getcontext, Decimal, ROUND_UP
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from django.apps import apps
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from django.db import models
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from django.utils import timezone
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from core.utils import get_setting
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from .querysets import SongQuerySet
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# Set decimal precision
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getcontext().prec = 16
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class SongManager(models.Manager):
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"""
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Custom object manager for filtering out common behaviors for a playlist.
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"""
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def get_queryset(self):
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"""
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Return customized default QuerySet for Songs.
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"""
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return SongQuerySet(self.model, using=self._db)
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def available(self):
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"""
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Songs that are currently published and are enabled.
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"""
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return self.get_queryset().songs().enabled().published()
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def playlist_length(self):
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"""
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Total length of available songs in the playlist (in seconds).
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"""
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return self.available().aggregate(models.Sum('length'))['length__sum']
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def wait_total(self):
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"""
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Default length in seconds before a song can be played again. This is
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based on the replay ratio set in the application settings.
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"""
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wait = self.playlist_length() * Decimal(get_setting('replay_ratio'))
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wait = wait.quantize(Decimal('.01'), rounding=ROUND_UP)
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return timedelta(seconds=float(wait))
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def datetime_from_wait(self):
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"""
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Datetime of now minus the default wait time for played songs.
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"""
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return timezone.now() - self.wait_total()
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def playable(self):
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"""
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Songs that are playable because they are available (enabled &
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published) and they have not been played within the default wait time
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(or at all).
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"""
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return self.available().filter(
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models.Q(last_played__lt=self.datetime_from_wait()) |
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models.Q(last_played__isnull=True)
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)
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def requestable(self):
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"""
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Songs that can be placed in the request queue for playback.
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"""
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# Import SongRequest here to get rid of circular dependencies
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SongRequest = apps.get_model(app_label='profiles',
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model_name='SongRequest')
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requests = SongRequest.music.unplayed().values_list('song__id',
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flat=True)
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return self.playable().exclude(id__in=requests)
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